Their str is in their bows. A 50% bow limit is nothing to scoff at. That is really the purpose of their foot soldier. But to utilize the 50% bow limit you cant firld much else besides southrons. Even mahud will cancel out your bigger bow limit.

Isnt harad at 1/3 bow limit? it is eastern kingdoms that is at 50% bow limit.

Anyway, i have played harad 4 times now and all of them went pretty good (2 wins-2 looses, but losses were still good games as my opponents played good and tactical)

I do not know at how many points you play your games but my examples will be at 600 to 850 points

VS dwarfs (win)
Haradrim raiders thrived. They are an amazing cavalry for their points + lances, they butchered the dwarf with great ease, picking 6-8 of them + 4-5 serpent riders are amazing combination as you use the simple raiders for body-shield and distraction but in the same time they can still kill pretty easily. I wont mention half trolls/watchers/abrakhan guard, they did amazing job
Bows were useless against dwarfs sadly.

VS Wood elves (win)
I took 2 warbands of haradrim warriors and they did their job, witch was to die! simple warriors are for 2 purposes, body-shield and swarm , both went good as almost none of my elites died from elf bows and in the end elves were so outnumbered that all the fights were 3-1

VS gondor (lose)
the reason for the loss of this match was boromir, i simply could not stop him as soon as i lost my ringwraith (knight of umbar) he kept butchering while it was hard to kill his simple footmen. Still Raiders did a good job and also i lasted long after force was broken simply because i had a hornblower (ALWAYS ALWAYS ALWAYS pick on when playing harad ALWAYS!) it was a good battle in overall.

VS isengard (loss)
Crossbows just butchered everything, he maxed out in numbers so he could pick as many crossbows as possible.My simple haradrim warriors did protect most of my elites but still when i reached him i couldnt do much in close combat vs a tight phalanx of uruks, no matter how much i tried to flank and swarm him every fight was 3v2 (counting his 2 lines of pikemen). Vrasku was like a machine gun killing my heroes and his simple uruks just kept winning every fight (also a little bit of luck from his side) but still, i did not have many losses after force was broken and my opponent played tacticaly, making it a good battle aswell

Conclusion, you dont expect haradrim warriors to much other than protect your elites from bowfire and try to trap your enemy, they are still decent for that job and you need numbers for harad and ALWAYS ALWAYS pick a hornblower, hide him somewhere far on the map untill your force is broken.
Raiders are very good cavalry for their points, the reason is: cheap lances!
Chieftains are not much of heroes, but when you also pick a taskmaster you have the chance of performing a heroic action every turn, witch is great.
For last if you pick an army of elites they will go down from bowfire pretty soon and with so low def (without having numbers) they will go down fast aswell.

2-I did play vs ghaladrim + old mirkwood, this fight was pretty much easy but against the new mirkwood jerks (as you call them) i believe i would have lost too rangers are just a bane for swarming armies like harad sadly, i have not face them yet gladly.

Why on earth wouldn't you use Courage? It's a rather fundamental part of the game.

I could be entirely wrong, but I get the impression that you're trying to play your Haradrim Warriors in a generic shieldwall,

I do rather like regular Haradrim troops. Until the most recent update they were under costed slightly (1pt) now they're perfect and have lots of nice upgrade options. They add spear support to your force easily and are offensively dominant, if used correctly. They also make nice meat - shields for your elites

New Hobbit models are rough......in Combat those Mirkwood dudes are tough. Your swarming would only result in more deaths per turn

Not a single doupt about that. Still i would like to try against them with a pure force of arhcery as infatry and every other model Cavalry (prefer raiders). Outshoot them in every turn and Cavalry still counts as 1 model against mirkwood rangers, thus not activating their special rule. However this is only a guess, i never tried it...

In any case not every army is good against everything, like i said i found out in a harsh way that harad is next to useless vs isengard.

For last i would not see a full elite harad army working out as even their elites lack def, only way would be to add atleast a warband or frontline of black numenorians they way i see it.

The key to beat dwarfs is:
1-swarming, dwarves are expensive and even more expensive heroes, they have no spear support and no cavalry. So if you throw a meat shield on them (haradrim warriors) to keep them busy all the time it is really easy to flank them and trap them in most cases. Do not bother killing their frontline as that is next to imposible, aim for any banner first, then their high str units (khazad guard/iron guard)
2-Use harads +1 bonuses, only half trolls have str to wound dwarves easily, everything else in your army (even str 4) is useless, so try to wound them using harads tricks, like abrakhan guard (5+ to wound dwarves) Cavalry with lances(5+ if he has lance).
-3 do not rely much on heroes, 1 suladan or knight of umbar is enouph to be the leader and everything else should be the cheapest captains just to boost your numbers (with warbands) Haradrim heroes are no better than your units when it comes to wound dwarves.
-4 NO ARCHERY vs dwarves, haradrim archers or arbalesters are useless vs dwarves, do not even bother picking any at all, they will eat out your points.